The device may not actually have the beginning few sectors. Use skip= to try to read something from the middle of the media.
Yes, I actually have seen this before. The firmware 'fakes' a partition table on the first attempt to read one, but sector 0 really isn't there. Matt On Tue, Sep 17, 2002 at 02:50:32PM -0500, Thomas Dodd wrote: > > Mark C. Wrote: > >>> [root@stimpy dev]# dd if=/dev/sda of=/dev/null bs=1k count=1 > >>> dd: reading `/dev/sda': Input/output error > >>> 0+0 records in > >>> 0+0 records out > > > Randy.Dunlap wrote: > > On Tue, 17 Sep 2002, Jonathan Corbet wrote: > > > > | > > | You might try just using dd to copy your card to disk with an offset of 25 > > | sectors, and see of you can mount the resulting image. > > > > This is a bit like what we (JE, David Brownell, and I) saw at > > the USB plugfest in 1999. We had a camera device that we > > couldn't mount as a filesystem, but we could dd it. > > When we did that and studied the dd-ed file, we could see a > > FAT filesystem beginning after the first <N> blocks (but more than > > 25 sectors IIRC -- more like after 50-100 KB, or maybe even more). > > See the above form Mark's post. He tried to dd a 1K block > and it failed. Granted, The first few blocks may need to be skipped, > but right now he cannot even get the raw data out. > > If we can get the data, we can use the loop device to mount it. > > Any ideas to figure out the why the dd fails? > > -Thomas > > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to [EMAIL PROTECTED] > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- Matthew Dharm Home: [EMAIL PROTECTED] Maintainer, Linux USB Mass Storage Driver How would you like this tie wrapped around your hairy round head? -- Greg User Friendly, 9/2/1998
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